Envelope power stacker



FIG. 1 is an isometric view of the envelope power stacker showing my new design;

FIG. 2 is an end view thereof;

FIG. 3 is an end view thereof opposite the end view shown in FIG. 2;

FIG. 4 is a top plan view thereof;

FIG. 5 is a side elevational view thereof;

FIG. 6 is a side elevational view thereof opposite the side shown in FIG. 5. 

The ornamental design for an envelope power stacker, as shown. 